This is the latest window design from Hehr.  It offers a fantastic "frameless look".
These windows are SPECIAL ORDERED and are made for the RV original equipment manufactures.
They are NOT alike !
In order to get the correct replacement window you MUST remove the original window from the coach and get the Hehr part number from the backside of the window frame.
I looks like the picture below.

Vent and exit sections utilize a hidden hinge design giving a flush automotive look.  All outside glass edges have a "pencil" edge for safety and appearance.  4" radius for all outside glass corners.  Bonding technology is used to bond the glass to the window frame. Standard clamp ring installation.  Uses 1/2" thick glass panels in the insulated window versions.